Update dependency org.jetbrains.kotlin.jvm to v2.1.21

Author: renovate[bot]

gradle/libs.versions.toml

@@ -6,7 +6,7 @@ equalsverifier = "3.19.3"
 hamcrest = "3.0"
 jgrapht = "1.5.2"
 junit5 = "5.12.2"
-kotlin-jvm = "2.1.20"
+kotlin-jvm = "2.1.21"
 kotlinx-coroutines = "1.10.2"
 sonarqube-plugin = "6.1.0.5360"
 struts2 = "7.0.3"